Medium Arithmetic Puzzles

#4060: 8 _ 8 _ 4 _ 9 = 7 medium #4061: 8 _ 8 _ 4 _ 2 = -7 medium #4064: 8 _ 8 _ 5 _ 2 = 11 medium #4068: 8 _ 8 _ 6 _ 3 = 12 medium #4070: 8 _ 8 _ 6 _ 4 = -4 medium #4071: 8 _ 8 _ 6 _ 9 = -4 medium #4072: 8 _ 8 _ 7 _ 4 = -6 medium #4074: 8 _ 8 _ 8 _ 4 = -8 medium #4077: 8 _ 8 _ 9 _ 6 = -4 medium #4084: 8 _ 9 _ 3 _ 4 = -4 medium #4094: 8 _ 9 _ 4 _ 3 = -4 medium #4106: 8 _ 9 _ 4 _ 8 = 10 medium #4107: 8 _ 9 _ 4 _ 9 = 9 medium #4111: 8 _ 9 _ 6 _ 8 = -4 medium #4113: 8 _ 9 _ 6 _ 2 = 10 medium #4115: 8 _ 9 _ 6 _ 3 = 9 medium #4118: 8 _ 9 _ 6 _ 4 = 8 medium #4121: 8 _ 9 _ 6 _ 5 = 7 medium #4122: 8 _ 9 _ 6 _ 6 = 6 medium #4130: 8 _ 9 _ 8 _ 6 = -4 medium #4135: 9 _ 1 _ 3 _ 9 = 6 medium #4137: 9 _ 1 _ 4 _ 8 = 7 medium #4138: 9 _ 2 _ 2 _ 4 = 8 medium #4153: 9 _ 2 _ 3 _ 8 = -2 medium #4154: 9 _ 2 _ 3 _ 9 = -3 medium #4156: 9 _ 2 _ 4 _ 8 = 8 medium #4157: 9 _ 2 _ 4 _ 2 = 8 medium #4158: 9 _ 2 _ 4 _ 6 = 6 medium #4166: 9 _ 2 _ 4 _ 9 = 9 medium #4172: 9 _ 2 _ 6 _ 3 = 6 medium #4174: 9 _ 2 _ 6 _ 4 = 7 medium #4176: 9 _ 2 _ 6 _ 5 = -2 medium #4178: 9 _ 2 _ 6 _ 6 = 9 medium #4179: 9 _ 2 _ 6 _ 6 = -3 medium #4180: 9 _ 2 _ 6 _ 7 = -4 medium #4182: 9 _ 2 _ 6 _ 8 = -5 medium #4183: 9 _ 2 _ 6 _ 9 = -6 medium #4189: 9 _ 2 _ 8 _ 4 = 10 medium #4190: 9 _ 2 _ 8 _ 4 = 8 medium #4202: 9 _ 2 _ 9 _ 5 = 10 medium #4209: 9 _ 3 _ 2 _ 3 = -3 medium #4210: 9 _ 3 _ 2 _ 4 = -5 medium #4221: 9 _ 3 _ 2 _ 8 = -2 medium #4223: 9 _ 3 _ 2 _ 9 = -3 medium #4224: 9 _ 3 _ 3 _ 9 = 8 medium #4225: 9 _ 3 _ 3 _ 2 = 9 medium #4227: 9 _ 3 _ 3 _ 2 = -3 medium #4228: 9 _ 3 _ 3 _ 3 = -6 medium